User interface interaction paradigms for eyewear device with limited field of view

ABSTRACT

An eyewear device presents, via an image display, an initial displayed image. The initial displayed image has an initial field of view corresponding to an initial head direction or an initial eye direction. Eyewear device detects movement of a user of the eyewear device by: (i) tracking, via a head movement tracker, a head movement of a head of the user, or (ii) tracking, via an eye movement tracker, an eye movement of an eye of the user of the eyewear device. Eyewear device determines a field of view adjustment to the initial field of view of the initial displayed image based on the detected movement of the user. Field of view adjustment includes a successive field of view corresponding to a successive head direction or a successive eye direction. Eyewear device generates a successive displayed image based on the field of view adjustment and presents the successive displayed image.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to U.S. Provisional Application Ser.No. 62/714,239 entitled USER INTERFACE INTERACTION PARADIGMS FOR EYEWEARDEVICE WITH LIMITED FIELD OF VIEW, filed on Aug. 3, 2018, the contentsof which are incorporated fully herein by reference.

TECHNICAL FIELD

The present subject matter relates to wearable devices, e.g., eyeweardevices, with a limited field of view and adjustments to a userinterface based on head or eye movement by a user.

BACKGROUND

Wearable devices, including portable eyewear devices, such assmartglasses, headwear, and headgear, available today integrate imagedisplays and cameras. Viewing and interacting with the displayed contenton the devices can be difficult due to the small image display areaavailable on the wearable device. For example, size limitations and theform factor of the image display of a wearable eyewear device can makenavigation difficult to incorporate into the devices.

A graphical user interface (GUI) is a type of user interface that allowsusers to interact with an electronic device through graphical icons andvisual indicators such as secondary notation, instead of a text-baseduser interfaces, typed command labels, or text navigation. However, theavailable area for placement of graphical user interface elements on theimage display of the eyewear device is limited. Due to the small formfactor of the eyewear device, viewing, manipulating, and interactingwith displayed content on the image display is cumbersome. For example,finding a displayed object can require multiple swipes, taps, and otherfinger gestures. Accordingly, a need exists to simplify userinteractions with eyewear devices.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawing figures depict one or more implementations, by way ofexample only, not by way of limitations. In the figures, like referencenumerals refer to the same or similar elements.

FIG. 1A is a side view of an example hardware configuration of aneyewear device, which shows a right optical assembly with an imagedisplay, and field of view adjustments are applied to a user interfacepresented on the image display based on detected head or eye movement bya user.

FIG. 1B is a top cross-sectional view of a chunk of the eyewear deviceof FIG. 1A depicting a visible light camera, a head movement tracker fortracking the head movement of the user of the eyewear device, and acircuit board.

FIG. 2A is a rear view of an example hardware configuration of aneyewear device, which includes an eye movement tracker on a frame, fortracking the eye movement of the user of the eyewear device.

FIG. 2B is a rear view of an example hardware configuration of aneyewear device, which includes an eye movement tracker on a chunk, fortracking the eye movement of the user of the eyewear device.

FIGS. 2C and 2D are rear views of example hardware configurations of theeyewear device, including two different types of image displays.

FIG. 3 shows a rear perspective sectional view of the eyewear device ofFIG. 2A depicting an infrared camera, a frame front, a frame back, and acircuit board.

FIG. 4 is a cross-sectional view taken through the infrared camera andthe frame of the eyewear device of FIG. 3.

FIG. 5 shows a rear perspective sectional view of the eyewear device ofFIG. 2A depicting an infrared emitter, an infrared camera, a framefront, a frame back, and a circuit board.

FIG. 6 is a cross-sectional view taken through the infrared emitter andthe frame of the eyewear device of FIG. 5.

FIG. 7 is a top cross-sectional view of the chunk of the eyewear deviceof FIG. 2B depicting the visible light camera, the infrared emitter, theinfrared camera, and a circuit board.

FIG. 8A depicts an example of a pattern of infrared light emitted by aninfrared emitter of the eyewear device and reflection variations of theemitted pattern of infrared light captured by the infrared camera of theeyewear device to track eye movement by the user.

FIG. 8B depicts the emitted pattern of infrared light being emitted bythe infrared emitter of the eyewear device in an inwards facing angle ofcoverage towards an eye of the user to track eye movement by the user.

FIG. 9A is a high-level functional block diagram of an example userinterface field of view adjustment system including the eyewear devicewith an eye movement tracker, a mobile device, and a server systemconnected via various networks.

FIG. 9B is a high-level functional block diagram of an example userinterface field of view adjustment system, which is very similar to FIG.9A, but utilizes the head movement tracker instead of the eye movementtracker.

FIG. 10A shows an example of a hardware configuration for the mobiledevice of the user interface field of view adjustment system of FIG. 9A,based on detected eye movement, in simplified block diagram form.

FIG. 10B shows an example of a hardware configuration for the mobiledevice of the user interface field of view adjustment system of FIG. 9B,based on detected head movement, in simplified block diagram form.

FIG. 11A shows various alternate locations for the eye movement trackeron the eyewear device, which can be used individually or in combination.

FIGS. 11B, 11C, and 11D illustrate the effects of the various alternatelocations on the eye movement tracker on the eyewear device with respectto different orientations of the eye of the user.

FIG. 12 is a flowchart of the operation of the eyewear device toimplement user interface field of view adjustments utilizing the eyemovement tracker.

FIG. 13 is a flowchart of the operation of the eyewear device toimplement user interface field of view adjustments utilizing the headmovement tracker.

FIG. 14A illustrates an example of an initial displayed image thatincludes three-dimensional animated characters.

FIG. 14B illustrates an example of a successive displayed image thatincludes different three-dimensional animated characters than FIG. 14Abecause of a field of view adjustment resulting from right horizontaleye movement.

FIG. 15A illustrates an example in which an animated character isoutside of the observable visual area and angle of view of an initialfield of view of the initial displayed image.

FIG. 15B illustrates an example of a successive displayed imagegenerated based on a field of view adjustment resulting from lefthorizontal eye or head movement of the user wearing the eyewear devicewhile initial displayed image of FIG. 15A is being presented.

FIG. 16A illustrates an example of an initial displayed image in whichweather information is outside of the observable visual area and angleof view of an initial field of view of the initial displayed image.

FIG. 16B illustrates another example of a successive displayed imagegenerated based on a field of view adjustment resulting from upwardsvertical head or eye movement while initial displayed image of FIG. 16Ais being presented.

FIGS. 17A-D illustrate schematic views of displayed images beinggenerated based on a field of view adjustment.

DETAILED DESCRIPTION

In the following detailed description, numerous specific details are setforth by way of examples in order to provide a thorough understanding ofthe relevant teachings. However, it should be apparent to those skilledin the art that the present teachings may be practiced without suchdetails. In other instances, description of well-known methods,procedures, components, and circuitry are set forth at a relativelyhigh-level, without detail, in order to avoid unnecessarily obscuringaspects of the present teachings.

The term “coupled” or “connected” as used herein refers to any logical,optical, physical or electrical connection, link or the like by whichelectrical or magnetic signals produced or supplied by one systemelement are imparted to another coupled or connected element. Unlessdescribed otherwise, coupled or connected elements or devices are notnecessarily directly connected to one another and may be separated byintermediate components, elements or communication media that maymodify, manipulate or carry the electrical signals. The term “on” meansdirectly supported by an element or indirectly supported by the elementthrough another element integrated into or supported by the element.

The orientations of the eyewear device, associated components and anycomplete devices incorporating a head movement tracker or an eyemovement tracker such as shown in any of the drawings, are given by wayof example only, for illustration and discussion purposes. In operationfor determining field of view adjustments, the eyewear device may beoriented in any other direction suitable to the particular applicationof the eyewear device, for example up, down, sideways, or any otherorientation. Also, to the extent used herein, any directional term, suchas front, rear, inwards, outwards, towards, left, right, lateral,longitudinal, up, down, upper, lower, top, bottom, side, horizontal,vertical, and diagonal are used by way of example only, and are notlimiting as to direction or orientation of any head movement tracker oreye movement tracker or component of the head movement tracker of theeye movement tracker constructed as otherwise described herein.

To overcome the problem of the small field of view in head mounted imagedisplays on an eyewear device, adjustments to the user interfacepresented on the image display can be based on head or eye movementmeasurements from the user wearing the eyewear device. As furtherdescribed herein, head or eye movement measurements can be taken (e.g.,using an IMU or a camera). The sequential images presented on the imagedisplay are then adjusted according to the detected head or eyemovement.

Additional objects, advantages and novel features of the examples willbe set forth in part in the following description, and in part willbecome apparent to those skilled in the art upon examination of thefollowing and the accompanying drawings or may be learned by productionor operation of the examples. The objects and advantages of the presentsubject matter may be realized and attained by means of themethodologies, instrumentalities and combinations particularly pointedout in the appended claims.

Reference now is made in detail to the examples illustrated in theaccompanying drawings and discussed below.

FIG. 1A is a side view of an example hardware configuration of aneyewear device 100, which includes a right optical assembly 180B with animage display, that provides visual area adjustments to a user interfacepresented on the image display based on detected head or eye movement bya user. Eyewear device 100 includes multiple visible light cameras114A-B that form a stereo camera, of which the right visible lightcamera 114B is located on a right chunk 110B.

In the example of FIG. 1A, the left and right visible light cameras114A-B are sensitive to the visible light range wavelength. Each of thevisible light cameras 114A-B has a different frontward facing angle ofcoverage, for example, visible light camera 114B has the depicted angleof coverage 111B. The angle of coverage is an angle range in which theimage sensor of the visible light camera 114A-B picks up electromagneticradiation and generate images. Examples of such visible light cameras114A-B include a high-resolution complementary metal-oxide-semiconductor(CMOS) image sensor and a video graphic array (VGA) camera, such as 640p(e.g., 640×480 pixels for a total of 0.3 megapixels), 720p, or 1080p.Image sensor data from the visible light cameras 114A-B are capturedalong with geolocation data, digitized by an image processor, and storedin a memory.

To provide stereoscopic vision, visible light cameras 114A-B may becoupled to an image processor (element 912 of FIGS. 9A-B) for digitalprocessing along with a timestamp in which the image of the scene iscaptured. Image processor 912 includes circuitry to receive signals fromthe visible light camera 114A-B and to process those signals from thevisible light camera 114A-B into a format suitable for storage in thememory. The timestamp can be added by the image processor or otherprocessor, which controls operation of the visible light cameras 114A-B.Visible light cameras 114A-B allow the stereo camera to simulate humanbinocular vision. The stereo camera provides the ability to reproducethree-dimensional images based on two captured images from the visiblelight cameras 114A-B having the same timestamp. Such three-dimensionalimages allow for an immersive life-like experience, e.g., for virtualreality or video gaming. For stereoscopic vision, a pair of images isgenerated at a given moment in time—one image for each of the left andright visible light cameras 114A-B. When the pair of generated imagesfrom the frontward facing angles of coverage 111A-B of the left andright visible light cameras 114A-B are stitched together (e.g., by theimage processor), depth perception is provided by the optical assembly180A-B.

In an example, a user interface field of view adjustment system includesthe eyewear device 100. The eyewear device 100 includes a frame 105, aright temple 125B extending from a right lateral side 170B of the frame105, and an image display (e.g., optical assembly 180A-B) to present agraphical user interface to a user. The eyewear device 100 includes aleft visible light camera 114A connected to the frame 105 or the lefttemple 125A to capture a first image of the scene. Eyewear device 100further includes a right visible light camera 114B connected to theframe 105 or the right temple 125B to capture (e.g., simultaneously withthe left visible light camera 114A) a second image of the scene whichpartially overlaps the first image. Although not shown in FIGS. 1A-B,the user interface field of view adjustment system further includes aprocessor (element 932 of FIGS. 9A-B) coupled to the eyewear device 100and connected to the visible light cameras 114A-B, a memory (element 934of FIGS. 9A-B) accessible to the processor 932, and programming in thememory (element 934 of FIGS. 9A-B), for example in the eyewear device100 itself or another part of the user interface field of viewadjustment system.

Although not shown in FIG. 1A, the eyewear device 100 also includes ahead movement tracker (element 109 of FIG. 1B) or an eye movementtracker (element 213 of FIGS. 2A-B). Eyewear device 100 further includesthe image display of optical assembly 180A-B for presenting a sequenceof displayed images and an image display driver (element 942 of FIGS.9A-B) coupled to the image display of optical assembly 180A-B to controlthe image display of optical assembly 180A-B to present the sequence ofdisplayed images, which are described in further detail below. Eyeweardevice 100 further includes a memory (element 934 of FIGS. 9A-B) and aprocessor (element 932 of FIGS. 9A-B) having access to the image displaydriver (element 942 of FIGS. 9A-B) and the memory (element 934 of FIGS.9A-B). Eyewear device 100 further includes programming (element 934 ofFIGS. 9A-B) in the memory. Execution of the programming by the processor(element 932 of FIGS. 9A-B) configures the eyewear device 100 to performfunctions, including functions to present, via the image display 942, aninitial displayed image of the sequence of displayed images, the initialdisplayed image having an initial field of view corresponding to aninitial head direction or an initial eye direction (e.g., eye gazedirection). Examples of initial displayed images 1405A, 1505A, and 1605Aare shown in FIGS. 14A, 15A, and 16A.

Execution of the programming by the processor (element 932 of FIGS.9A-B) further configures the eyewear device 100 to detect movement of auser of the eyewear device by: (i) tracking, via the head movementtracker (element 109 of FIG. 1B), a head movement of a head of the user,or (ii) tracking, via the eye movement tracker (element 213 of FIGS.2A-B), an eye movement of an eye of the user of the eyewear device 100.Execution of the programming by the processor (element 932 of FIGS.9A-B) further configures the eyewear device 100 to determine a field ofview adjustment to the initial field of view of the initial displayedimage based on the detected movement of the user. The field of viewadjustment includes a successive field of view corresponding to asuccessive head direction or a successive eye direction. Execution ofthe programming by the processor (element 932 of FIGS. 9A-B) furtherconfigures the eyewear device 100 to generate a successive displayedimage of the sequence of displayed images based on the field of viewadjustment. Execution of the programming by the processor (element 932of FIGS. 9A-B) further configures the eyewear device 100 to present, viathe image display of the optical assembly 180A-B, the successivedisplayed image. Examples of successive displayed images 1405B, 1505B,and 1605B are shown in FIGS. 14A, 15A, and 16A based on field of viewadjustments 1410, 1510, and 1610.

FIG. 1B is a top cross-sectional view of the chunk of the eyewear device100 of FIG. 1A depicting the right visible light camera 114B, a headmovement tracker 109, and a circuit board. Construction and placement ofthe left visible light camera 114A is substantially similar to the rightvisible light camera 114B, except the connections and coupling are onthe left lateral side 170A. As shown, the eyewear device 100 includesthe right visible light camera 114B and a circuit board, which may be aflexible printed circuit board (PCB) 140. The right hinge 226B connectsthe right chunk 110B to a right temple 125B of the eyewear device 100.In some examples, components of the right visible light camera 114B, theflexible PCB 140, or other electrical connectors or contacts may belocated on the right temple 125B or the right hinge 226B.

As shown, eyewear device 100 has a head movement tracker 109, whichincludes, for example, an inertial measurement unit (IMU). An inertialmeasurement unit is an electronic device that measures and reports abody's specific force, angular rate, and sometimes the magnetic fieldsurrounding the body, using a combination of accelerometers andgyroscopes, sometimes also magnetometers. The inertial measurement unitworks by detecting linear acceleration using one or more accelerometersand rotational rate using one or more gyroscopes. Typical configurationsof inertial measurement units contain one accelerometer, gyro, andmagnetometer per axis for each of the three axes: horizontal axis forleft-right movement (X), vertical axis (Y) for top-bottom movement, anddepth or distance axis for up-down movement (Z). The gyroscope detectsthe gravity vector. The magnetometer defines the rotation in themagnetic field (e.g., facing south, north, etc.) like a compass whichgenerates a heading reference. The three accelerometers to detectacceleration along the horizontal, vertical, and depth axis definedabove, which can be defined relative to the ground, the eyewear device100, or the user wearing the eyewear device 100.

Eyewear device 100 detects movement of the user of the eyewear device100 by tracking, via the head movement tracker 109, the head movement ofthe head of the user. The head movement includes a variation of headdirection on a horizontal axis, a vertical axis, or a combinationthereof from the initial head direction during presentation of theinitial displayed image on the image display. In one example, tracking,via the head movement tracker 109, the head movement of the head of theuser includes measuring, via the inertial measurement unit 109, theinitial head direction on the horizontal axis (e.g., X axis), thevertical axis (e.g., Y axis), or the combination thereof (e.g.,transverse or diagonal movement). Tracking, via the head movementtracker 109, the head movement of the head of the user further includesmeasuring, via the inertial measurement unit 109, a successive headdirection on the horizontal axis, the vertical axis, or the combinationthereof during presentation of the initial displayed image.

Tracking, via the head movement tracker 109, the head movement of thehead of the user further includes determining the variation of headdirection based on both the initial head direction and the successivehead direction. Detecting movement of the user of the eyewear device 100further includes in response to tracking, via the head movement tracker109, the head movement of the head of the user, determining that thevariation of head direction exceeds a deviation angle threshold on thehorizontal axis, the vertical axis, or the combination thereof. Thedeviation angle threshold is between about 3° to 10°. As used herein,the term “about” when referring to an angle means±10% from the statedamount.

Variation along the horizontal axis slides three-dimensional objects,such as characters, bitmojis, application icons, etc. in and out of thefield of view by, for example, hiding, unhiding, or otherwise adjustingvisibility of the three-dimensional object. Variation along the verticalaxis, for example, when the user looks upwards, in one example, displaysweather information, time of day, date, calendar appointments, etc. Inanother example, when the user looks downwards on the vertical axis, theeyewear device 100 may power down.

The right chunk 110B includes chunk body 211 and a chunk cap, with thechunk cap omitted in the cross-section of FIG. 1B. Disposed inside theright chunk 110B are various interconnected circuit boards, such as PCBsor flexible PCBs, that include controller circuits for right visiblelight camera 114B, microphone(s), low-power wireless circuitry (e.g.,for wireless short range network communication via Bluetooth™),high-speed wireless circuitry (e.g., for wireless local area networkcommunication via WiFi).

The right visible light camera 114B is coupled to or disposed on theflexible PCB 140 and covered by a visible light camera cover lens, whichis aimed through opening(s) formed in the right chunk 110B. In someexamples, the frame 105 connected to the right chunk 110B includes theopening(s) for the visible light camera cover lens. The frame 105includes a front-facing side configured to face outwards away from theeye of the user. The opening for the visible light camera cover lens isformed on and through the front-facing side. In the example, the rightvisible light camera 114B has an outwards facing angle of coverage 111Bwith a line of sight or perspective of the right eye of the user of theeyewear device 100. The visible light camera cover lens can also beadhered to an outwards facing surface of the right chunk 110B in whichan opening is formed with an outwards facing angle of coverage, but in adifferent outwards direction. The coupling can also be indirect viaintervening components.

Left (first) visible light camera 114A is connected to a first imagedisplay of left optical assembly 180A to generate a first backgroundscene of a first successive displayed image. Right (second) visiblelight camera 114B is connected to a second image display of rightoptical assembly 180B to generate a second background scene of a secondsuccessive displayed image. The first background scene and the secondbackground scene partially overlap to present a three-dimensionalobservable area of the successive displayed image.

Flexible PCB 140 is disposed inside the right chunk 110B and is coupledto one or more other components housed in the right chunk 110B. Althoughshown as being formed on the circuit boards of the right chunk 110B, theright visible light camera 114B can be formed on the circuit boards ofthe left chunk 110A, the temples 125A-B, or frame 105.

FIG. 2A is a rear view of an example hardware configuration of aneyewear device 100, which includes an eye movement tracker 213 on aframe 105, for tracking the eye movement of the user of the eyeweardevice 100. As shown in FIG. 2A, the eyewear device 100 is in a formconfigured for wearing by a user, which are eyeglasses in the example.The eyewear device 100 can take other forms and may incorporate othertypes of frameworks, for example, a headgear, a headset, or a helmet.

In the eyeglasses example, eyewear device 100 includes a frame 105including a left rim 107A connected to a right rim 107B via a bridge 106adapted for a nose of the user. The left and right rims 107A-B includerespective apertures 175A-B which hold a respective optical element180A-B, such as a lens and a display device. As used herein, the termlens is meant to cover transparent or translucent pieces of glass orplastic having curved and/or flat surfaces that cause light toconverge/diverge or that cause little or no convergence or divergence.

Although shown as having two optical elements 180A-B, the eyewear device100 can include other arrangements, such as a single optical element ormay not include any optical element 180A-B depending on the applicationor intended user of the eyewear device 100. As further shown, eyeweardevice 100 includes a left chunk 110A adjacent the left lateral side170A of the frame 105 and a right chunk 110B adjacent the right lateralside 170B of the frame 105. The chunks 110A-B may be integrated into theframe 105 on the respective sides 170A-B (as illustrated) or implementedas separate components attached to the frame 105 on the respective sides170A-B. Alternatively, the chunks 110A-B may be integrated into temples(not shown) attached to the frame 105.

In the example of FIG. 2A, the eye movement tracker 213 of the eyeweardevice 100 includes an infrared emitter 215 and an infrared camera 220.Visible light cameras typically include a blue light filter to blockinfrared light detection, in an example, the infrared camera 220 is avisible light camera, such as a low resolution video graphic array (VGA)camera (e.g., 640×480 pixels for a total of 0.3 megapixels), with theblue filter removed. The infrared emitter 215 and the infrared camera220 are co-located on the frame 105, for example, both are shown asconnected to the upper portion of the left rim 107A. As described infurther detail below, the frame 105 or one or more of the left and rightchunks 110A-B include a circuit board that includes the infrared emitter215 and the infrared camera 220. The infrared emitter 215 and theinfrared camera 220 can be connected to the circuit board by soldering,for example.

Other arrangements of the infrared emitter 215 and infrared camera 220can be implemented, including arrangements in which the infrared emitter215 and infrared camera 220 are both on the right rim 107B, or indifferent locations on the frame 105, for example, the infrared emitter215 is on the left rim 107A and the infrared camera 220 is on the rightrim 107B. In another example, the infrared emitter 215 is on the frame105 and the infrared camera 220 is on one of the chunks 110A-B, or viceversa. The infrared emitter 215 can be connected essentially anywhere onthe frame 105, left chunk 110A, or right chunk 110B to emit a pattern ofinfrared light on the eye of the user. Similarly, the infrared camera220 can be connected essentially anywhere on the frame 105, left chunk110A, or right chunk 110B to capture at least one reflection variationin the emitted pattern of infrared light from the eye of the user.

The infrared emitter 215 and infrared camera 220 are arranged to faceinwards towards the eye of the user with a partial or full angle ofcoverage of the eye in order to pick up an infrared image of the eye totrack eye movement of the eye of the user. For example, the infraredemitter 215 and infrared camera 220 are positioned directly in front ofthe eye, in the upper part of the frame 105 or in the chunks 110A-B ateither ends of the frame 105. The eye movement includes a variation ofeye direction on a horizontal axis, a vertical axis, or a combinationthereof from the initial eye direction during presentation of theinitial displayed image on the image display of optical assembly 180A-B.

Eye movement tracker 213 can track eye movement by measuring the pointof eye gaze direction (where the user is looking in the optical assembly180A-B of the eyewear device 100), comparing currently captured imagesto previously captured calibration images, or detecting motion of theeye relative to the head. For example, eye movement tracker 213non-invasively measures eye motion utilizing video images from which theeye position is extracted. As noted above, a pattern of infrared lightis emitted by the infrared emitter 215 and infrared light is reflectedback from the eye with variations which are sensed and imaged by a videocamera, such as infrared camera 220. Data forming the picked up infraredimage is then analyzed to extract eye rotation from changes in thereflection variations. Such video-based eye movement trackers typicallyutilize corneal reflection (first Purkinje image) and the center of thepupil as features to track over time. In a second example, thedual-Purkinje eye movement tracker, utilizes reflections from the frontof the cornea (first Purkinje image) and the back of the lens (fourthPurkinje image) as features to track. In a third example, image featuresfrom inside the eye are tracked, such as the retinal blood vessels, andthese features are followed as the eye of the user rotates.

Calibration of the eyewear device 100 based on the unique anatomicalfeatures of the eyes of the user may be performed before using the eyemovement tracker 213 to track eye position. Generally, the user looks ata point or series of points, while the eye movement tracker 213 recordsthe value that corresponds to each gaze position. Prior to presenting,via the image display of the optical assembly 180A-B, the initialdisplayed image, eyewear device 100 calibrates the eye movement tracker213 by presenting, via the image display of optical assembly 180A-B, aseries of calibration images for viewing by the eye of the user. Each ofthe calibration images has a respective point of interest at arespective known fixed position on the horizontal axis and the verticalaxis. In response to the eye of the user viewing the respective point ofinterest, eyewear device 100 records, in an eye direction (e.g.,scanpath) database, anatomical feature positions of the eye in relationto the respective known fixed position of the respective point ofinterest.

After calibration, the video-based eye movement tracker 213 can focus onone or both eyes of the user and records eye movement as the user (e.g.,wearer of the eyewear device 100) looks at the image display of opticalassembly 180A-B. When infrared or near-infrared non-collimated light isshined on the pupil of the eye as the pattern of infrared light by theinfrared emitter 215, corneal reflections are created in the reflectionvariations of infrared light. The vector between the pupil center andthe corneal reflections in the captured infrared images contain thereflection variations of infrared light and can be used to compute thepoint of regard on surface or the eye gaze direction.

Two general types of infrared and near-infrared (also known as activelight) eye movement tracking techniques can be utilized: bright-pupiland dark-pupil. Whether bright-pupil or dark-pupil is utilized dependson the location of the illumination source (infrared emitter 215) withrespect to the infrared camera 220 and the eye of the user. If theillumination from the infrared emitter 215 is coaxial with the opticalpath, then the eye acts as a retroreflector as the light reflects offthe retina creating a bright pupil effect similar to red eye. If theillumination from the infrared emitter 215 is offset from the opticalpath, then the pupil appears dark because the retro reflection from theretina is directed away from the infrared camera 220.

In one example, the infrared emitter 215 of the eye movement tracker 213emits infrared light illumination on the user's eye, which can benear-infrared light or other short-wavelength beam of low-energyradiation. Alternatively, or additionally, the eye movement tracker 213may include an emitter that emits other wavelengths of light besidesinfrared and the eye movement tracker 213 further includes a camerasensitive to that wavelength that receives and captures images with thatwavelength. For example, the eye movement tracker 213 may comprise avisible light camera that captures light in the visible light range fromthe eye, such as a red, green, and blue (RGB) camera.

As noted above, the eyewear device 100 is coupled to a processor and amemory, for example in the eyewear device 100 itself or another part ofthe system. Eyewear device 100 or the system can subsequently processimages captured of the eye, for example, a coupled memory and processorin the system to process the captured images of the eye to track eyemovement. Such processing of the captured images establishes a scanpathto identify movement of the user's eye. The scanpath includes thesequence or series of eye movements based on captured reflectionvariations of the eye. Eye movements are typically divided into suchfixations and saccades—when the eye gaze pauses in a certain position,and when it moves to another position, respectively. The resultingseries of fixations and saccades is called the scanpath. Smooth pursuitdescribes the eye following a moving object. Fixational eye movementsinclude micro saccades: small, involuntary saccades that occur duringattempted fixation. The scanpaths are then utilized to determine thefield of view adjustment.

An eye direction database (see element 950 of FIG. 9A) can beestablished during calibration. Since the known fixed position of therespective point of interests during calibration are known, thatscanpath database (element 950 of FIG. 9A) can be used to establishsimilarities to the previously calibration images. Because the knownfixed position of the point of interest is known when the calibrationimage and is recorded in the eye direction database, the eyewear device100 can determine where the eye of the user is looking by comparingcurrently captured images of the eye with the eye direction database(element 950 of FIG. 9A). The calibration image(s) which mostly closelyresembles the currently captured image can have the known fixed positionof the point of interest utilized as a good approximation of the eyedirection for the currently captured image.

FIG. 2B is a rear view of an example hardware configuration of anothereyewear device 200. In this example configuration, the eyewear device200 is depicted as including an eye movement tracker 213 on a rightchunk 210B for tracking the eye movement of the user of the eyeweardevice. As shown, the infrared emitter 215 and the infrared camera 220are co-located on the right chunk 210B. It should be understood that theeye movement tracker 213 or one or more components of the eye movementtracker 213 can be located on the left chunk 210A and other locations ofthe eyewear device 200, for example, the frame 105. Eye movement tracker213 has an infrared emitter 215 and infrared camera 220 like that ofFIG. 2A, but the eye movement tracker 213 can be varied to be sensitiveto different light wavelengths as described previously in FIG. 2A.

Similar to FIG. 2A, the eyewear device 200 includes a frame 105 whichincludes a left rim 107A which is connected to a right rim 107B via abridge 106; and the left and right rims 107A-B include respectiveapertures which hold a respective optical element 180A-B.

FIGS. 2C-D are rear views of example hardware configurations of theeyewear device 100, including two different types of image displays. Inone example, the image display of optical assembly 180A-B includes anintegrated image display. As shown in FIG. 2C, the optical assembly180A-B includes a suitable display matrix 170 of any suitable type, suchas a liquid crystal display (LCD), an organic light-emitting diode(OLED) display, or any other such display. The optical assembly 180A-Balso includes an optical layer or layers 176, which can include lenses,optical coatings, prisms, mirrors, waveguides, optical strips, and otheroptical components in any combination. The optical layers 176A-N caninclude a prism having a suitable size and configuration and including afirst surface for receiving light from display matrix and a secondsurface for emitting light to the eye of the user. The prism of theoptical layers 176A-N extends over all or at least a portion of therespective apertures 175A-B formed in the left and right rims 107A-B topermit the user to see the second surface of the prism when the eye ofthe user is viewing through the corresponding left and right rims107A-B. The first surface of the prism of the optical layers 176A-Nfaces upwardly from the frame 105 and the display matrix overlies theprism so that photons and light emitted by the display matrix impingethe first surface. The prism is sized and shaped so that the light isrefracted within the prism and is directed towards the eye of the userby the second surface of the prism of the optical layers 176A-N. In thisregard, the second surface of the prism of the optical layers 176A-N canbe convex to direct the light towards the center of the eye. The prismcan optionally be sized and shaped to magnify the image projected by thedisplay matrix 170, and the light travels through the prism so that theimage viewed from the second surface is larger in one or more dimensionsthan the image emitted from the display matrix 170.

In another example, the image display device of optical assembly 180A-Bincludes a projection image display as shown in FIG. 2D. The opticalassembly 180A-B includes a laser projector 150, which is a three-colorlaser projector using a scanning mirror or galvanometer. Duringoperation, an optical source such as a laser projector 150 is disposedin or on one of the temples 125A-B of the eyewear device 100. Opticalassembly 180-B includes one or more optical strips 155A-N spaced apartacross the width of the lens of the optical assembly 180A-B or across adepth of the lens between the front surface and the rear surface of thelens.

As the photons projected by the laser projector 150 travel across thelens of the optical assembly 180A-B, the photons encounter the opticalstrips 155A-N. When a particular photon encounters a particular opticalstrip, the photon is either redirected towards the user's eye, or itpasses to the next optical strip. A combination of modulation of laserprojector 150, and modulation of optical strips, may control specificphotons or beams of light. In an example, a processor controls opticalstrips 155A-N by initiating mechanical, acoustic, or electromagneticsignals. Although shown as having two optical assemblies 180A-B, theeyewear device 100 can include other arrangements, such as a single orthree optical assemblies, or the optical assembly 180A-B may havearranged different arrangement depending on the application or intendeduser of the eyewear device 100.

As further shown in FIGS. 2C-D, eyewear device 100 includes a left chunk110A adjacent the left lateral side 170A of the frame 105 and a rightchunk 110B adjacent the right lateral side 170B of the frame 105. Thechunks 110A-B may be integrated into the frame 105 on the respectivelateral sides 170A-B (as illustrated) or implemented as separatecomponents attached to the frame 105 on the respective sides 170A-B.Alternatively, the chunks 110A-B may be integrated into temples 125A-Battached to the frame 105 via hinges 126A-B.

In one example, the image display includes a first image display and asecond image display. Eyewear device 100 includes first and secondapertures 175A-B which hold a respective first and second opticalassembly 180A-B. The first optical assembly 180A includes the firstimage display (e.g., a display matrix 170A of FIG. 2C or optical strips155A-N′ and a projector 150A). The second optical assembly 180B includesthe second image display e.g., a display matrix 170B of FIG. 2C oroptical strips 155A-N″ and a projector 150B). The successive field ofview of the successive displayed image includes an angle of view betweenabout 15° to 30, and more specifically 24°, measured horizontally,vertically, or diagonally. The successive displayed image having thesuccessive field of view represents a combined three-dimensionalobservable area visible through stitching together of two displayedimages presented on the first and second image displays.

As used herein, “an angle of view” describes the angular extent of thefield of view associated with the displayed images presented on each ofthe left and right image displays of optical assembly 180A-B. The “angleof coverage” describes the angle range that a lens of visible lightcameras 114A-B or infrared camera 220 can image. Typically, the imagecircle produced by a lens is large enough to cover the film or sensorcompletely, possibly including some vignetting toward the edge. If theangle of coverage of the lens does not fill the sensor, the image circlewill be visible, typically with strong vignetting toward the edge, andthe effective angle of view will be limited to the angle of coverage.The “field of view” is intended to describe the field of observable areawhich the user of the eyewear device 100 can see through his or her eyesvia the displayed images presented on the left and right image displaysof the optical assembly 180A-B. Image display of optical assembly 180A-Bcan have a field of view with an angle of coverage between 15° to 30°,for example 24°, and have a resolution of 480×480 pixels.

FIG. 3 shows a rear perspective sectional view of the eyewear device ofFIG. 2A depicting an infrared camera 220, a frame front 330, a frameback 335, and a circuit board. It can be seen that the upper portion ofthe left rim 107A of the frame 105 of the eyewear device 100 includes aframe front 330 and a frame back 335. The frame front 330 includes afront-facing side configured to face outwards away from the eye of theuser. The frame back 335 includes a rear-facing side configured to faceinwards towards the eye of the user. An opening for the infrared camera220 is formed on the frame back 335.

As shown in the encircled cross-section 4-4 of the upper middle portionof the left rim of the frame, a circuit board, which is a flexibleprinted circuit board (PCB) 340, is sandwiched between the frame front330 and the frame back 335. Also shown in further detail is theattachment of the left chunk 110A to the left temple 325A via a lefthinge 326A. In some examples, components of the eye movement tracker213, including the infrared camera 220, the flexible PCB 340, or otherelectrical connectors or contacts may be located on the left temple 325Aor the left hinge 326A.

In an example, the left chunk 110A includes a chunk body 311, a chunkcap 312, an inwards facing surface 391 and an outwards facing surface392 (labeled, but not visible). Disposed inside the left chunk 110A arevarious interconnected circuit boards, such as PCBs or flexible PCBs,which include controller circuits for charging, a battery, inwardsfacing light emitting diodes (LEDs), and outwards (forward) facing LEDs.

FIG. 4 is a cross-sectional view through the infrared camera 220 and theframe corresponding to the encircled cross-section 4-4 of the eyeweardevice of FIG. 3. Various layers of the eyewear device 100 are visiblein the cross-section of FIG. 4. As shown, the flexible PCB 340 isdisposed on the frame front 330 and connected to the frame back 335. Theinfrared camera 220 is disposed on the flexible PCB 340 and covered byan infrared camera cover lens 445. For example, the infrared camera 220is reflowed to the back of the flexible PCB 340. Reflowing attaches theinfrared camera 220 to electrical contact pad(s) formed on the back ofthe flexible PCB 340 by subjecting the flexible PCB 340 to controlledheat which melts a solder paste to connect the two components. In oneexample, reflowing is used to surface mount the infrared camera 220 onthe flexible PCB 340 and electrically connect the two components.However, it should be understood that through-holes can be used toconnect leads from the infrared camera 220 to the flexible PCB 340 viainterconnects, for example.

The frame back 335 includes an infrared camera opening 450 for theinfrared camera cover lens 445. The infrared camera opening 450 isformed on a rear-facing side of the frame back 335 that is configured toface inwards towards the eye of the user. In the example, the flexiblePCB 340 can be connected to the frame front 330 via a flexible PCBadhesive 460. The infrared camera cover lens 445 can be connected to theframe back 335 via infrared camera cover lens adhesive 455. Theconnection can be indirect via intervening components.

FIG. 5 shows a rear perspective view of the eyewear device of FIG. 2A.The eyewear device 100 includes an infrared emitter 215, infrared camera220, a frame front 330, a frame back 335, and a circuit board 340. As inFIG. 3, it can be seen in FIG. 5 that the upper portion of the left rimof the frame of the eyewear device 100 includes the frame front 330 andthe frame back 335. An opening for the infrared emitter 215 is formed onthe frame back 335.

As shown in the encircled cross-section 6-6 in the upper middle portionof the left rim of the frame, a circuit board, which is a flexible PCB340, is sandwiched between the frame front 330 and the frame back 335.Also shown in further detail is the attachment of the left chunk 110A tothe left temple 325A via the left hinge 326A. In some examples,components of the eye movement tracker 213, including the infraredemitter 215, the flexible PCB 340, or other electrical connectors orcontacts may be located on the left temple 325A or the left hinge 326A.

FIG. 6 is a cross-sectional view through the infrared emitter 215 andthe frame corresponding to the encircled cross-section 6-6 of theeyewear device of FIG. 5. Multiple layers of the eyewear device 100 areillustrated in the cross-section of FIG. 6, as shown the frame includesthe frame front 330 and the frame back 335. The flexible PCB 340 isdisposed on the frame front 330 and connected to the frame back 335. Theinfrared emitter 215 is disposed on the flexible PCB 340 and covered byan infrared emitter cover lens 645. For example, the infrared emitter215 is reflowed to the back of the flexible PCB 340. Reflowing attachesthe infrared emitter 215 to contact pad(s) formed on the back of theflexible PCB 340 by subjecting the flexible PCB 340 to controlled heatwhich melts a solder paste to connect the two components. In oneexample, reflowing is used to surface mount the infrared emitter 215 onthe flexible PCB 340 and electrically connect the two components.However, it should be understood that through-holes can be used toconnect leads from the infrared emitter 215 to the flexible PCB 340 viainterconnects, for example.

The frame back 335 includes an infrared emitter opening 650 for theinfrared emitter cover lens 645. The infrared emitter opening 650 isformed on a rear-facing side of the frame back 335 that is configured toface inwards towards the eye of the user. In the example, the flexiblePCB 340 can be connected to the frame front 330 via the flexible PCBadhesive 460. The infrared emitter cover lens 645 can be connected tothe frame back 335 via infrared emitter cover lens adhesive 655. Thecoupling can also be indirect via intervening components.

FIG. 7 is a top cross-sectional view of the right chunk 210B of theeyewear device of FIG. 2B. As shown, the eyewear device 200 includes theinfrared emitter 215, the infrared camera 220, and a circuit board,which may be a flexible PCB 740. The right chunk 210B is connected to aright temple 725B of the eyewear device 200 via the right hinge 726B. Insome examples, components of the eye movement tracker, including theinfrared emitter 215 and the infrared camera 220, the flexible PCB 740,or other electrical connectors or contacts may be located on the righttemple 725B or the right hinge 726B.

The right chunk 710B includes chunk body 711, an inwards facing surface791, and an outwards facing surface 792. The right chunk 710B alsoincludes a chunk cap (not shown) like the chunk cap 312 for the leftchunk in FIG. 3, but the chunk cap is removed in the cross-section ofFIG. 7. Disposed inside the right chunk 210B are various interconnectedcircuit boards, such as PCBs or flexible PCBs, that include controllercircuits for a visible light camera 714, microphone(s), low-powerwireless circuitry (e.g., for wireless short range network communicationvia Bluetooth™), high-speed wireless circuitry (e.g., for wireless localarea network communication via WiFi).

The right visible light camera 114B is disposed on a circuit board andcovered by a visible camera cover lens and has an outwards facing angleof coverage 111B. The frame front, which is connected to the right chunk210B, and the right chunk 210B can include opening(s) for the visiblelight camera cover lens. The frame front includes a front-facing sideconfigured to face outwards away from the eye of the user. The openingfor the visible light camera cover lens is formed on and through thefront-facing side. The infrared emitter 215 and infrared camera 220 havean inwards facing angle of coverage relative to the right visible lightcamera 114B having the outwards facing angle of coverage.

As shown, the infrared emitter 215 and the infrared camera 220 areco-located on the inwards facing surface 791 of the right chunk 210B topoint inwards towards the eye of the user. The inwards facing surface791 can be sloped such that it curves away from the upper portion of theright rim of the frame 205 where the inwards facing surface 791intersects the right rim and towards the right temple 725B to orient theinfrared emitter 215 and infrared camera 220 with an inwards facingfield of view and a line of sight of the eye of the user.

The infrared emitter 215 and the infrared camera 220 are coupled to theflexible PCB 740 in a manner that is similar to that shown and describedwith reference to FIGS. 3-6. For example, the flexible PCB 740 isdisposed inside the right chunk 710B between inwards facing surface 791and the outwards facing surface 792 of the right chunk 210B. FlexiblePCB 740 is coupled to one or more other components housed in the rightchunk 210B. The infrared emitter 215 is disposed on the flexible PCB 740and an infrared emitter cover lens covers the infrared emitter 215. Theinfrared camera 220 is also disposed on the flexible PCB 740 and aninfrared camera cover lens covers the infrared emitter 215. Althoughshown as being formed on the circuit boards of the right chunk 210B, theeye movement tracker, including the infrared emitter 215 and theinfrared camera 220, can be formed on the circuit boards of the leftchunk as shown in FIG. 3.

An infrared camera opening and infrared emitter opening are both formedon the inwards facing surface 791 of the right chunk 210B that areconfigured to face inwards towards the eye of the user. In the example,the flexible PCB 740 can be connected to the inwards facing surface 791and outwards facing surface 792 via a flexible PCB adhesive. Theinfrared emitter cover lens and infrared camera cover lens can beconnected to the inwards facing surface 791 via a cover lens adhesive.The coupling can also be indirect via intervening components.

FIG. 8A depicts an example of a pattern of infrared light emitted by aninfrared emitter 215 of the eyewear device and reflection variations ofthe emitted pattern of infrared light captured by the infrared camera220 of the eyewear device 100 to track eye movement by the user. FIG. 8Bdepicts the emitted pattern of infrared light 881 emitted by theinfrared emitter 215 of the eyewear device in an inwards facing angle ofcoverage towards an eye of a user 880 to track eye movement by the user.

The pattern of infrared light 881 can be a standardized matrix or beamof pixels that will outline a uniform light trace on the eye of the user880 (e.g., cornea, pupil, retina or iris). When the emitted pattern ofinfrared light 881 strikes the eye of the user 880, the infrared camera220 captures the reflection variations of the emitted pattern ofinfrared light 882, which can then be used to track eye movement bycomparing positions of the anatomical structures of the eye in thecaptured infrared images with an eye direction database (element 950 ofFIG. 9A) generated during calibration (e.g., to determine a scanpath).The eye direction database (element 950 of FIG. 9A) associatesanatomical structures of the eye which are specific to the user withknown fixed positions of a point of interest to determine eye movementangle changes. After the anatomical structures in the captured imagesare identified, those anatomical structures can be mapped to thecalibrated images associated with a known fixed position associated withpoints of interest to determine a corresponding eye direction of theuser. A similarity analysis can be performed by comparing the anatomicalstructures in the captured infrared images with the calibrated images inthe eye direction database (element 950 of FIG. 9A). The calibratedimage(s) in the eye direction database which match the positioning ofthe anatomical structures in the captured infrared images the closesthave a corresponding known fixed position of a respective point ofinterest retrieved from the eye direction database (element 950 of FIG.9A). The eye direction position can then be measured based on therespective known fixed position of the respective point of interest.

Emitted pattern of infrared light 881 is an unperceived low-energyinfrared beam that shines on the eye with a standardized path. Theamount of reflection of the emitted pattern of infrared light 881 variesin different parts of the eye (e.g., retinal blood vessels absorb lightmore than surrounding tissue) and the iris. Infrared camera 220 capturesthese reflection variations of the emitted pattern of infrared light882, which is digitized by the components of the system. For example,the wearable device includes or is coupled to image processor, memory,and processor for digitizing the reflection variations of the emittedpattern of infrared light 882. The reflection variations of the emittedpattern of infrared light 882 can then be compared to the eye directiondatabase (element 950 of FIG. 9A) detect eye movement.

To initially set up the user in the system during calibration, thereflection variations of the emitted pattern of infrared light 882 fromthe user's eye can be stored in the eye direction database ofcalibration images (element 950 of FIG. 9A), which includes images ofthe left and right eyes of the user. The system may then subsequentlycompare received reflection variations to this database to track eyemovement of the user. In an example, when the user is utilizing aneyewear device 100 for the first time, the infrared emitter 215 emitsthe emitted pattern of infrared light 881 and the infrared camera 220captures multiple images of the reflection variations of the emittedpattern of infrared light 882 in different parts of the user's eye(s).Eyewear device 100 presents, via the image display of optical assembly180A-B, a series of calibration images for viewing by the eye of theuser. Each of the calibration images has a respective point of interestat a respective known fixed position on the horizontal axis and thevertical axis. Eyewear device 100 stores the captured calibration imageswith the corresponding known position of the point of interest at thetime the calibration image was captured in the eye direction database ofcalibration images (element 950 of FIG. 9A) for subsequent analysis. Forexample, in response to the eye of the user viewing the respective pointof interest, eyewear device 100 records in the eye direction database(element 950 of FIG. 9A), anatomical feature positions of the eye inrelation to the respective known fixed position of the respective pointof interest.

If this is the first time the user has used the eyewear device 100, theeyewear device 100 will find no previously captured calibration imagesexist in the eye direction database (element 950 of FIG. 9A) that matchthe currently captured reflection variations of the emitted pattern ofinfrared light 882. In response to finding no matching captured infraredcalibration image exists, the eyewear device 100 updates the eyedirection database (element 950 of FIG. 9A) to store digitized images ofthe currently captured reflection variations of the emitted pattern ofinfrared light 882 as calibration images in the eye direction database(element 950 of FIG. 9A). During a subsequent use of the eyewear deviceat a later time, the updated database with the digitized reflectionvariations that were previously stored in the eye direction database(element 950 of FIG. 9A) are analyzed using algorithms. In one example,the algorithms employ mathematical and statistical techniques forpattern recognition of anatomical features to determine whether at leastone subsequently captured image of reflection variations of that sameuser of the eyewear device 100 matches one or more of the previouslycaptured digitized images that are stored and exist in the eye directiondatabase (element 950 of FIG. 9A) to determine eye direction based onthe known fixed position.

In an example, eyewear device 100 tracks, via the eye movement tracker213, the eye movement of the eye of the user by initially emitting, viathe infrared emitter 215, the pattern of infrared light 881A on the eyeof the user 880 of the eyewear device 100. Eyewear device 100 captures,via the infrared camera, initial reflection variations 882A in theinitially emitted pattern of infrared light 881A on the eye of the user880. Eyewear device 100 measures, the initial eye direction on thehorizontal axis, the vertical axis, or the combination thereof bycomparing the initial reflection variations of the initially emittedpattern of infrared light on the eye of the user 880 against the eyedirection database (element 950 of FIG. 9A). Eyewear device 100successively emits, via the infrared emitter 220, the pattern ofinfrared light 881B on the eye of the user 880 of the eyewear device100. Eyewear device captures, via the infrared camera 220, successivereflection variations 882B in the successively emitted pattern ofinfrared light 881B on the eye of the user. Eyewear device 100 measures,the successive eye direction on the horizontal axis, the vertical axis,or the combination thereof by comparing the successive reflectionvariations 882B of the successively emitted pattern of infrared light881B on the eye of the user against the eye direction database (element950 of FIG. 9A). Eyewear device 100 determines the variation of headdirection based on both the initial eye direction and the successive eyedirection. It should be understood that the foregoing functionality canbe embodied in programming instructions of a user interface field ofview adjustment application or programming found in one or morecomponents of the system.

FIG. 9A is a high-level functional block diagram of an example userinterface field of view adjustment system 900. The user interfaceadjustment system 900 includes a wearable device, which is the eyeweardevice 100 with an eye movement tracker 213 (e.g., shown as infraredemitter 215 and infrared camera 220), in the example. User interfaceadjustments system 900 also includes a mobile device 990 and a serversystem 998 connected via various networks. Mobile device 990 may be asmartphone, tablet, laptop computer, access point, or any other suchdevice capable of connecting with eyewear device 100 using both alow-power wireless connection 925 and a high-speed wireless connection937. Mobile device 990 is connected to server system 998 and network995. The network 995 may include any combination of wired and wirelessconnections.

Eyewear device 100 includes at least two visible light cameras 114A-B(one associated with the left lateral side 170A and one associated withthe right lateral side 170B). Eyewear device 100 further includes twoimage displays of the optical assembly 180A-B (one associated with theleft lateral side 170A and one associated with the right lateral side170B). Eyewear device 100 also includes image display driver 942, imageprocessor 912, low-power circuitry 920, and high-speed circuitry 930.The components shown in FIG. 9A for the eyewear device 100 are locatedon one or more circuit boards, for example a PCB or flexible PCB, in thetemples. Alternatively or additionally, the depicted components can belocated in the chunks, frames, hinges, or bridge of the eyewear device100. Left and right visible light cameras 114A-B can include digitalcamera elements such as a complementary metal-oxide-semiconductor (CMOS)image sensor, charge coupled device, a lens, or any other respectivevisible or light capturing elements that may be used to capture data,including images of scenes with unknown objects.

Memory 934 includes an eye direction database of calibrated images ofeyes of the user 950 that are captured during the calibration procedureof the eye movement tracker 213. Memory 934 further includes initialimages of reflection variations of the emitted pattern of infrared light959A-N and successive images of reflection variations of emitted patternof infrared light 960A-N. Memory 934 further includes eye movementtracking programming 945 to perform the functions described herein,including the user interface field of view adjustment interactions withthe displayed content presented on left and right image displays ofoptical assembly 180A-B.

Eye movement tracking programming 945 implements the user interfacefield of view adjustment instructions, including, to cause the eyeweardevice 100 to track, via the eye movement tracker 213, the eye movementof the eye of the user of the eyewear device 100. Other implementedinstructions (functions) cause the eyewear device 100 to determine, afield of view adjustment to the initial field of view of an initialdisplayed image based on the detected eye movement of the usercorresponding to a successive eye direction. Further implementedinstructions generate a successive displayed image of the sequence ofdisplayed images based on the field of view adjustment. The successivedisplayed image is produced as visible output to the user via the userinterface. This visible output appears on the image display of opticalassembly 180A-B, which is driven by image display driver 942 to presentthe sequence of displayed images, including the initial displayed imagewith the initial field of view and the successive displayed image withthe successive field of view. A flowchart outlining functions which canbe implemented in the eye movement tracking programing 945 is shown inFIG. 12.

As shown in FIG. 9A, high-speed circuitry 930 includes high-speedprocessor 932, memory 934, and high-speed wireless circuitry 936. In theexample, the image display driver 942 is coupled to the high-speedcircuitry 930 and operated by the high-speed processor 932 in order todrive the left and right image displays of the optical assembly 180A-B.High-speed processor 932 may be any processor capable of managinghigh-speed communications and operation of any general computing systemneeded for eyewear device 100. High-speed processor 932 includesprocessing resources needed for managing high-speed data transfers onhigh-speed wireless connection 937 to a wireless local area network(WLAN) using high-speed wireless circuitry 936. In certain embodiments,the high-speed processor 932 executes an operating system such as aLINUX operating system or other such operating system of the eyeweardevice 100 and the operating system is stored in memory 934 forexecution. In addition to any other responsibilities, the high-speedprocessor 932 executing a software architecture for the eyewear device100 is used to manage data transfers with high-speed wireless circuitry936. In certain embodiments, high-speed wireless circuitry 936 isconfigured to implement Institute of Electrical and Electronic Engineers(IEEE) 802.11 communication standards, also referred to herein as Wi-Fi.In other embodiments, other high-speed communications standards may beimplemented by high-speed wireless circuitry 936.

Low-power wireless circuitry 924 and the high-speed wireless circuitry936 of the eyewear device 100 can include short range transceivers(Bluetooth™) and wireless wide, local, or wide area network transceivers(e.g., cellular or WiFi). Mobile device 990, including the transceiverscommunicating via the low-power wireless connection 925 and high-speedwireless connection 937, may be implemented using details of thearchitecture of the eyewear device 100, as can other elements of network995.

Memory 934 includes any storage device capable of storing various dataand applications, including, among other things, camera data generatedby the left and right visible light cameras 114A-B and the imageprocessor 912, as well as images generated for display by the imagedisplay driver 942 on the image displays of the optical assembly 180A-B.While memory 934 is shown as integrated with high-speed circuitry 930,in other embodiments, memory 934 may be an independent standaloneelement of the eyewear device 100. In certain such embodiments,electrical routing lines may provide a connection through a chip thatincludes the high-speed processor 932 from the image processor 912 orlow-power processor 922 to the memory 934. In other embodiments, thehigh-speed processor 932 may manage addressing of memory 934 such thatthe low-power processor 922 will boot the high-speed processor 932 anytime that a read or write operation involving memory 934 is needed.

Server system 998 may be one or more computing devices as part of aservice or network computing system, for example, that include aprocessor, a memory, and network communication interface to communicateover the network 995 with the mobile device 990 and eyewear device 100.Eyewear device 100 is connected with a host computer. For example, theeyewear device 100 is paired with the mobile device 990 via thehigh-speed wireless connection 937 or connected to the server system 998via the network 995.

Output components of the eyewear device 100 include visual components,such as the left and right image displays of optical assembly 180A-B asdescribed in FIGS. 2C-D (e.g., a display such as a liquid crystaldisplay (LCD), a plasma display panel (PDP), a light emitting diode(LED) display, a projector, or a waveguide). The image displays of theoptical assembly 180A-B are driven by the image display driver 942. Theoutput components of the eyewear device 100 further include acousticcomponents (e.g., speakers), haptic components (e.g., a vibratorymotor), other signal generators, and so forth. The input components ofthe eyewear device 100, the mobile device 990, and server system 998,may include alphanumeric input components (e.g., a keyboard, a touchscreen configured to receive alphanumeric input, a photo-opticalkeyboard, or other alphanumeric input components), point-based inputcomponents (e.g., a mouse, a touchpad, a trackball, a joystick, a motionsensor, or other pointing instruments), tactile input components (e.g.,a physical button, a touch screen that provides location and force oftouches or touch gestures, or other tactile input components), audioinput components (e.g., a microphone), and the like.

Eyewear device 100 may optionally include additional peripheral deviceelements. Such peripheral device elements may include biometric sensors,additional sensors, or display elements integrated with eyewear device100. For example, peripheral device elements may include any I/Ocomponents including output components, motion components, positioncomponents, or any other such elements described herein.

For example, the biometric components of the user interface field ofview adjustment 900 include components to detect expressions (e.g., handexpressions, facial expressions, vocal expressions, body gestures, oreye tracking), measure biosignals (e.g., blood pressure, heart rate,body temperature, perspiration, or brain waves), identify a person(e.g., voice identification, retinal identification, facialidentification, fingerprint identification, or electroencephalogrambased identification), and the like. The motion components includeacceleration sensor components (e.g., accelerometer), gravitation sensorcomponents, rotation sensor components (e.g., gyroscope), and so forth.The position components include location sensor components to generatelocation coordinates (e.g., a Global Positioning System (GPS) receivercomponent), WiFi or Bluetooth™ transceivers to generate positioningsystem coordinates, altitude sensor components (e.g., altimeters orbarometers that detect air pressure from which altitude may be derived),orientation sensor components (e.g., magnetometers), and the like. Suchpositioning system coordinates can also be received over wirelessconnections 925 and 937 from the mobile device 990 via the low-powerwireless circuitry 924 or high-speed wireless circuitry 936.

FIG. 9B is a high-level functional block diagram of an example userinterface field of view adjustment system 900, which is very similar toFIG. 9A, but utilizes the head movement tracker 109 instead of the eyemovement tracker 213. In the example, the head movement tracker 109includes an inertial measurement unit (IMU). Memory 934 includes aninitial head direction measurements 951X-Z which correspond to principalaxes measurements on the horizontal axis (X axis), vertical axis (Yaxis), and depth or distance axis (Z axis) as measured by the headmovement tracker 109. In certain applications of IMUs, the principalaxes are referred to as pitch, roll, and yaw axes. Memory 934 alsoincludes successive head direction measurements 961X-Z. Memory 934further includes head movement tracking programming 946 to perform thefunctions described herein, including the user interface field of viewadjustment interactions with the displayed content presented on left andright image displays of optical assembly 180A-B.

Head movement tracking programming 946 implements the user interfacefield of view adjustment instructions, including, to cause the eyeweardevice 100 to track, via the head movement tracker 109, the headmovement of the head of the user of the eyewear device 100. Otherimplemented instructions cause the eyewear device 100 to determine, afield of view adjustment to the initial field of view of an initialdisplayed image based on the detected head movement of the usercorresponding to a successive head direction. Further instructionsgenerate a successive displayed image of the sequence of displayedimages based on the field of view adjustment. The successive displayedimage is produced as visible output to the user via the user interface.This visible output appears on the left and right image displays ofoptical assembly 180A-B, which is driven by image display driver 942 topresent the sequence of displayed images, including the initialdisplayed image with the initial field of view and the successivedisplayed image with the successive field of view.

Head movement tracking programing 946 includes instructions to afterpresenting, via the image display, the successive displayed image,detect fixation of the head of the user of the eyewear device 100 bymeasuring, via the head movement tracker 109 (inertial measurementunit), an updated head direction on a horizontal axis, a vertical axis,or a combination thereof during presentation of the successive displayedimage corresponding to an updated head direction. Fixation of the headis further detected by determining the updated head direction is withina deviation angle threshold of the initial head direction on thehorizontal axis, the vertical axis, or the combination thereof toindicate negligible head movement of the user thereby indicatingfixation.

Head movement tracking programing 946 includes instructions to inresponse to detecting fixation of the head of the user of the eyeweardevice 10, continuing to present, via the image display of the opticalassembly 180A-B, the successive displayed image. The instruction ofdetecting fixation of the head of the user of the eyewear device 100further includes determining a time variation between an initial timeoccurring at time of measurement of the initial head direction and anupdated time occurring at time of measurement of the updated headdirection. Head movement tracking programming 946 further includesinstructions to configure the eyewear device 100 to response todetermining that the time variation exceeds a deviation time thresholdthereby indicating the user of the eyewear device is idle, power downthe eyewear device. A flowchart of functions which can be implemented inthe head movement tracking programing 946 is outlined in FIG. 13.

FIG. 10A is a high-level functional block diagram of an example of amobile device 990 that communicates via the eye movement based userinterface field of view adjustment system 900 of FIG. 9A. FIG. 10B isvery similar to FIG. 10A, but is a block diagram for a mobile device 990that communicates via the head movement based user interface field ofview adjustment system 900 of FIG. 9B.

In FIG. 10A, flash memory 1040A includes an eye direction database ofcalibrated images of eyes of the user 1050 that are captured during thecalibration procedure of the eye movement tracker 213. Flash memory1040A further includes initial images of reflection variations of theemitted pattern of infrared light 1059A-N and successive images ofreflection variations of emitted pattern of infrared light 1060A-N.Flash memory 1040A further includes eye movement tracking programming1045 to perform the functions described herein, including the userinterface field of view adjustment interactions with the displayedcontent presented on left and right image displays of optical assembly180A-B. In other examples, the user interface field of view adjustmentscan be utilized to generate displayed images presented on the touchscreen display of the mobile device 990, for example, when the mobiledevice 990 includes components like the eyewear device 100, includingthe eye movement tracker 213.

With further reference to FIG. 10A, eye movement tracking programming1045 implements the user interface field of view adjustmentinstructions, including, to cause the eyewear device 100 to track, viathe eye movement tracker 213, the eye movement of the eye of the user ofthe eyewear device 100. Other implemented instructions (functions) causethe eyewear device 100 to determine, a field of view adjustment to theinitial field of view of an initial displayed image based on thedetected eye movement of the user corresponding to a successive eyedirection. Further functions generate a successive displayed image ofthe sequence of displayed images based on the field of view adjustment.The successive displayed image is produced as visible output to the uservia the user interface. This visible output appears on the image displayof optical assembly 180A-B, which is driven by image display driver 942to present the sequence of displayed images, including the initialdisplayed image with the initial field of view and the successivedisplayed image with the successive field of view. In other examples,when the mobile device 990 includes components like the eyewear device100, including the eye movement tracker 213, the visible output canappear on the touch screen display of mobile device 990, which is drivenby the depicted driver and controller of FIG. 10A.

In FIG. 10B, flash memory 1040A includes an initial head directionmeasurements 1051X-Z which correspond to principal axes measurements onthe horizontal axis (X axis), vertical axis (Y axis), and depth ordistance axis (Z axis) as measured by the head movement tracker 109.Flash memory 1040A also includes successive head direction measurements1061X-Z. Flash memory 1040A further includes head movement trackingprogramming 1046 to perform the functions described herein, includingthe user interface field of view adjustment interactions with thedisplayed content presented on left and right image displays of opticalassembly 180A-B. In other examples, the user interface field of viewadjustments can be utilized to generate displayed images presented onthe touch screen display of the mobile device 990, for example, when themobile device 990 includes components like the eyewear device 100,including the head movement tracker 109.

With further reference to FIG. 10B, head movement tracking programming1046 implements the user interface field of view adjustmentinstructions, including, to cause the eyewear device 100 to track, viathe head movement tracker 109, the head movement of the head of the userof the eyewear device 100. Other implemented instructions cause theeyewear device 100 to determine, a field of view adjustment to theinitial field of view of an initial displayed image based on thedetected head movement of the user corresponding to a successive headdirection. Further functions generate a successive displayed image ofthe sequence of displayed images based on the field of view adjustment.The successive displayed image is produced as visible output to the uservia the user interface. This visible output appears on the image displayof optical assembly 180A-B, which is driven by image display driver 942to present the sequence of displayed images, including the initialdisplayed image with the initial field of view and the successivedisplayed image with the successive field of view. In other examples,when the mobile device 990 includes components like the eyewear device100, including the head movement tracker 109, the visible output appearson the touch screen display of mobile device 990, which is driven by thedepicted driver and controller of FIG. 10B.

Examples of touch screen type mobile devices that may be used include(but are not limited to) a smart phone, a personal digital assistant(PDA), a tablet computer, a laptop computer, or other portable device.However, the structure and operation of the touch screen type devices isprovided by way of example; and the subject technology as describedherein is not intended to be limited thereto. For purposes of thisdiscussion, FIGS. 10A-B therefore provide block diagram illustrations ofthe example mobile device 990 having a touch screen display fordisplaying content and receiving user input as (or as part of) the userinterface. Mobile device 990 also includes a camera(s) 1070, such asvisible light camera(s).

The activities that are the focus of discussions here typically involvedata communications related to eye movement or head movement trackingfor determining field of view adjustments to displayed images in aportable eyewear device 100. As shown in FIG. 10, the mobile device 990includes at least one digital transceiver (XCVR) 1010, shown as WWANXCVRs, for digital wireless communications via a wide area wirelessmobile communication network. The mobile device 990 also includesadditional digital or analog transceivers, such as short range XCVRs1020 for short-range network communication, such as via NFC, VLC, DECT,ZigBee, Bluetooth™, or WiFi. For example, short range XCVRs 1020 maytake the form of any available two-way wireless local area network(WLAN) transceiver of a type that is compatible with one or morestandard protocols of communication implemented in wireless local areanetworks, such as one of the Wi-Fi standards under IEEE 802.11 andWiMAX.

To generate location coordinates for positioning of the mobile device990, the mobile device 990 can include a global positioning system (GPS)receiver. Alternatively, or additionally the mobile device 990 canutilize either or both the short range XCVRs 1020 and WWAN XCVRs 1010for generating location coordinates for positioning. For example,cellular network, WiFi, or Bluetooth™ based positioning systems cangenerate very accurate location coordinates, particularly when used incombination. Such location coordinates can be transmitted to the eyeweardevice over one or more network connections via XCVRs 1020.

The transceivers 1010, 1020 (network communication interface) conformsto one or more of the various digital wireless communication standardsutilized by modern mobile networks. Examples of WWAN transceivers 1010include (but are not limited to) transceivers configured to operate inaccordance with Code Division Multiple Access (CDMA) and 3rd GenerationPartnership Project (3GPP) network technologies including, for exampleand without limitation, 3GPP type 2 (or 3GPP2) and LTE, at timesreferred to as “4G.” For example, the transceivers 1010, 1020 providetwo-way wireless communication of information including digitized audiosignals, still image and video signals, web page information for displayas well as web related inputs, and various types of mobile messagecommunications to/from the mobile device 990 for user interface field ofview adjustment.

Several of these types of communications through the transceivers 1010,1020 and a network, as discussed previously, relate to protocols andprocedures in support of communications with the eyewear device 100 orthe server system 998 for tracking head movement or eye movement foruser interface field of view adjustment. Such communications, forexample, may transport packet data via the short range XCVRs 1020 overthe wireless connections 925 and 937 to and from the eyewear device 100as shown in FIGS. 9A-B. Such communications, for example, may alsotransport data utilizing IP packet data transport via the WWAN XCVRs1010 over the network (e.g., Internet) 995 shown in FIGS. 9A-B. BothWWAN XCVRs 1010 and short range XCVRs 1020 connect through radiofrequency (RF) send-and-receive amplifiers (not shown) to an associatedantenna (not shown).

The mobile device 990 further includes a microprocessor, shown as CPU1030, sometimes referred to herein as the host controller. A processoris a circuit having elements structured and arranged to perform one ormore processing functions, typically various data processing functions.Although discrete logic components could be used, the examples utilizecomponents forming a programmable CPU. A microprocessor for exampleincludes one or more integrated circuit (IC) chips incorporating theelectronic elements to perform the functions of the CPU. The processor1030, for example, may be based on any known or available microprocessorarchitecture, such as a Reduced Instruction Set Computing (RISC) usingan ARM architecture, as commonly used today in mobile devices and otherportable electronic devices. Of course, other processor circuitry may beused to form the CPU 1030 or processor hardware in smartphone, laptopcomputer, and tablet.

The microprocessor 1030 serves as a programmable host controller for themobile device 990 by configuring the mobile device to perform variousoperations, for example, in accordance with instructions or programmingexecutable by processor 1030. For example, such operations may includevarious general operations of the mobile device, as well as operationsrelated to user interface field of view adjustment and communicationswith the eyewear device and server system. Although a processor may beconfigured by use of hardwired logic, typical processors in mobiledevices are general processing circuits configured by execution ofprogramming.

The mobile device 990 includes a memory or storage device system, forstoring data and programming. In the example, the memory system mayinclude a flash memory 1040A and a random access memory (RAM) 1040B. TheRAM 1040B serves as short term storage for instructions and data beinghandled by the processor 1030, e.g. as a working data processing memory.The flash memory 1040A typically provides longer term storage.

Hence, in the example of mobile device 990, the flash memory 1040A isused to store programming or instructions for execution by the processor1030. Depending on the type of device, the mobile device 990 stores andruns a mobile operating system through which specific applications,including eye movement tracking programming 1045 or head movementtracking programming 1046. Applications, such as the eye movementtracking programming 1045 or head movement tracking programming 1046,may be a native application, a hybrid application, or a web application(e.g., a dynamic web page executed by a web browser) that runs on mobiledevice 990 to provide user interface field of view adjustment. Examplesof mobile operating systems include Google Android, Apple iOS (I-Phoneor iPad devices), Windows Mobile, Amazon Fire OS, RIM BlackBerryoperating system, or the like.

It will be understood that the mobile device 990 is just one type ofhost computer in the user interface field of view adjustment system 900and that other arrangement may be utilized. For example, a server systemsuch as that shown in FIGS. 9A-B may host the eye direction database ofcalibration images of eyes of user 1050 and perform the comparison tomake the user interface field of view adjustment. Where the eyedirection database of calibration images of eyes of user 1050 and imagesof reflection variations of the emitted pattern of infrared light arestored and processed can vary depending on the security preferences ofthe user and the system requirements.

FIG. 11A shows various alternate locations for the eye movement trackeron the eyewear device, which can be used individually or in combination.A shown, multiple eye movement trackers 1113A-D can be included in theeyewear device 1100 to reduce errors in tracking eye movement of theuser, e.g., to determine a direction in which the user is looking (e.g.,line of sight) for eye tracking. In the example, there a four eyemovement trackers 1113A-D, and each eye movement tracker 1113A-Dincludes a respective infrared emitter 1115A-D and infrared camera1120A-D.

As shown, the frame 1105 includes opposing first and second lateralsides 1170A-B. A first chunk 1110A is integrated into the first lateralside 1170A of frame 1105. A second chunk 1110B is integrated into thesecond lateral side 1170B of frame 1105. A circuit board (not shown)spans the first chunk 1110A, the frame 1105, and the second chunk 1110B.The frame 1105 of the eyewear device 1100 includes an upper frameportion 1195, a middle frame portion 1196, and a lower frame portion1197.

As depicted in FIG. 11A, eye movement tracker 1113A is located on thefirst rim 1107A on the upper frame portion 1195. Eye movement tracker1113B is located on the second chunk 1110B. Eye movement tracker 1113Cis located on the first rim 1107A on the lower frame portion 1197. Eyemovement tracker 1113D is located on the first rim on the middle frameportion 1196.

Eyewear device 1100 includes a first eye movement tracker 1113A thatincludes a first infrared emitter 1115A and a first infrared camera1120A. Eyewear device 1100 also includes a second eye movement tracker1113B that includes a second infrared emitter 1115B and a secondinfrared camera 1120B. The second infrared emitter 1115B is connected tothe frame 1105 or the at least one chunk 1110A-B to emit a secondemitted pattern of infrared light. The second infrared camera 1120B isconnected to the frame 1105 or the at least one chunk 1110A-B to capturereflection variations in the second emitted pattern of infrared light.It should be understood that the first and second eye movement trackers1113A-B can include any combination of locations, or number of eyemovement trackers 1113A-D shown in FIG. 11A, including one, two, three,or four of the eye movement trackers 1113A-D. Additionally, the eyemovement trackers 1113A-D can be located on other portions of theeyewear device 1100, including the first chunk 1110A; upper, middle, andlower portions 1195-1197 of the second rim 1107B; the bridge 1106, orthe temples.

In an example, the eyewear device 1110 emits, via the second infraredemitter 1115B, the second emitted pattern of infrared light on a secondeye of the user of the eyewear device 1110. Eyewear device 100 captures,via the second infrared camera 1120B, reflection variations in thesecond emitted pattern of infrared light on the second eye of the user.Based on the reflection variations of the second emitted pattern ofinfrared light on the second eye of the user, the system determines adirection of a line of sight of the eyes of the user for eye tracking.

In some examples, the second emitted pattern of infrared light can bethe same or different from the first pattern of infrared light emittedby the first infrared emitter 1115A. The second infrared emitter 1115Band the second infrared camera 1120B can be co-located on the frame 1105or the at least one chunk 1110A-B as shown in FIG. 11. Although notshown in FIG. 11A, the first infrared emitter 1115A and the infraredcamera 1120A can be co-located on a first chunk 1110A. The secondinfrared emitter 1115B and the second infrared camera 1120B can beco-located on a second chunk 1110B.

As described and depicted in FIG. 2A and shown in FIG. 11A, the frame1105 of the eyewear device 1100 includes first and second eye rims1107A-B that have respective apertures to hold a respective opticalelement and the first and second eye rims 1107A-B are connected by abridge 1106. In an example, the first infrared emitter 1115A and thefirst infrared camera 1120A are co-located on the first eye rim 1107A.Although not shown in FIG. 11B, the second infrared emitter 1115B andthe second infrared camera 1120B can be co-located on the second eye rim1107B, including on the upper frame portion 1195, middle frame portion1196, and lower frame portion 1197.

FIGS. 11B-D illustrate the effects of the various alternate locations onthe eyewear device with respect to different orientations of the eye ofthe user. In FIG. 11B, the eye of the user 1180B is looking up.Accordingly, placement of the eye movement tracker 1113A, such as theinfrared emitter and infrared camera, on either the upper frame portion(e.g., top frame on the rims, bridge, etc.) or a chunk can accuratelycapture an image of the retina or iris of the eye of the user 1180Blooking up. Also, placement of the eye movement tracker 1113B on a lowerframe portion (e.g., bottom frame) of the eyewear device also accuratelycaptures an image of the retina or iris of the eye of the user 1180Blooking up. Hence both fields of view are depicted as suitable (OK).

In FIG. 11C, the eye of the user 1180C is looking straight ahead. Inthis scenario, again placement of the eye movement tracker 1113A oneither the upper frame portion or a chunk can accurately capture animage of the retina or iris of the eye of the user 1180C lookingstraight ahead. Also, placement of the eye movement tracker 1113B on thelower frame portion of the eyewear device accurately captures an imageof the retina or iris of the eye of the user 1180C looking straightahead.

In FIG. 11D, the eye of the user 1180D is looking down. In thisorientation of the eye of the user 1180D, placement of the eye movementtracker 1113A, on either the upper frame portion or a chunk may beinsufficient because the eyelid of the user 1180D can block the infraredcamera. Hence the field of view is depicted as not good (NG). However,placement of the eye movement tracker 1113B on the lower frame portionof the eyewear device can accurately capture an image of the retina oriris of the eye of the user 1180D looking down. Thus, having multipleeye movement trackers 1113A-B on the eyewear device can improveperformance of the user interface field of view adjustment system byimproving accuracy and reducing errors in eye movement tracking.Multiple eye movement trackers 1113A-B eye tracking directionalinformation by more accurately detecting the eye direction where theuser is looking (left, right, up, down, east, west, north, south, etc.).

FIG. 12 is a flowchart of the operation of the eyewear device 100 toimplement user interface field of view adjustments utilizing the eyemovement tracker 213. FIG. 13 is a flowchart of the operation of theeyewear device 100 to implement user interface field of view adjustmentsutilizing the head movement tracker 109. Because the blocks of FIGS.12-13 were already explained in detail previously, repetition is avoidedhere.

FIG. 14A illustrates an example of an initial displayed image 1405A thatincludes three-dimensional animated characters 1407A-B. Besidesthree-dimensional characters, display images presented on the imagedisplay of optical assembly 180A-B described herein can include manydifferent types of various three-dimensional graphical objects. In someexamples, three dimensional objects can include a bitmoji, anapplication icon (e.g., for a phone application), weather information,or a picture. Returning to the example of FIG. 14A, an initial field ofview 1406A of the initial displayed image 1405A includes a left animatedcharacter 1407A and a center animated character 1407B in the observablevisual area and angle of view. However, the initial field of view 1406Acorresponding to the initial head direction or initial eye direction hasa right animated character 1407C outside of the observable visual areaand angle of view. Thus, the right animated character 1407C does notappear in the initial displayed image 1405A.

FIG. 14B illustrates an example of a successive displayed image 1405Bthat includes different three-dimensional animated characters 1406B-Cthan FIG. 14A. Successive field of view 1406B of the successivedisplayed image 1405B includes a center animated character 1407B and aright animated character 1407C. However, the successive field of view1406B corresponding to the successive head direction or successive eyedirection has a left animated character 1407A outside of the observablevisual area and angle of view. Because the field of view adjustment 1410is horizontally to the right (e.g., by about 10°), the left animatedcharacter 1407A does not appear in the successive displayed image 1405B.Angles associated with detected eye movement or head movement can vary,and may be between 2° to 15° horizontally or vertically, for example.

In FIG. 14B, field of view adjustment 1405 renders visible (e.g.,unhides) a first three-dimensional graphical object (e.g., rightanimated character 1407C) which was not visible during the initialdisplayed image 1405A. The first three-dimensional graphical object(e.g., right animated character 1407C) is overlaid on a background sceneof the successive displayed image 1405B. Field of view adjustment 1410renders invisible (e.g., hides) a second three-dimensional graphicalobject (e.g., left animated character 1407A) which was visible duringthe initial displayed image 1405A. The second three-dimensionalgraphical object (e.g., left animated character 1407A) is removed fromthe background scene of the successive displayed image 1405B.

FIG. 15A illustrates an example in which an animated character 1507 isoutside of the observable visual area and angle of view of an initialfield of view 1506A of the initial displayed image 1505A. Animatedcharacter 1507 does not appear in the initial displayed image 1405A andis off to the left peripheral side. Thus, animated character 1507 is notvisible in the initial displayed image 1505A being presented on the leftand right image displays of optical assembly 180A-B.

FIG. 15B illustrates an example of a successive displayed image 1505Bgenerated based on a field of view adjustment 1510 resulting from eyemovement or head movement of the user while the user wears the eyeweardevice 100. While the initial displayed image 1505A of FIG. 15A is beingpresented on the left and right image displays of optical assembly180A-B, the user moves the head or eyes horizontally to the left. InFIG. 15B, the eye movement or head movement of the user wearing theeyewear device 100 is horizontally to the left by about 10°, forexample. As a result, animated character 1507 is in now in thesuccessive field of view 1506B of the successive displayed image 1505Band thus is visible in the successive displayed image 1505B presented onthe left and right image displays of optical assembly 180A-B.

FIG. 16A illustrates an example of an initial displayed image in whichweather information 1607B is not in an initial field of view 1606A ofthe initial displayed image 1605A. However, an animated character 1607Ais within the initial field of view 1606A.

FIG. 16B illustrates another example of a successive displayed image1606B generated based on a field of view adjustment 1610 to the initialdisplayed image of FIG. 16A. As shown, the weather information 1607B isin a successive field of view 1606B of the successive displayed image1605B. In FIG. 16B, the eye movement or head movement of the userwearing the eyewear device 100 is vertically upwards by about 30°, forexample. Consequently, animated character 1607A is not visible in thesuccessive field of view 1606B. But weather information 1607B is withinthe observable visual area and angle of view of the successive field ofview 1606B and is presented in the successive displayed image 1605B onthe left and right image displays of optical assembly 180A-B.

In the foregoing examples of three-dimensional imaging, left (first) andright (second) images are presented on the left (first) and right(second) image displays of optical assembly 180A-B are combined toprovide a three-dimensional interaction with the eyewear device 100. Forexample, in FIG. 16A-B the initial displayed image 1605A can be dividedinto a first initial displayed image having a first initial field ofview and a second initial displayed image having a second initial fieldof view for presentation on respective first and second image displaysof the optical assembly 180A-B. The determined field of view adjustment1610 can include a first field of view adjustment to the first initialfield of view of the first initial displayed image and a second field ofview adjustment to the second initial field of view of the secondinitial displayed image. Similarly, the successive displayed image 1605Bcan be divided into a first successive displayed image generated basedon the first field of view adjustment and a second successive displayedimage generated based on the second field of view adjustment forpresentation on the respective first and second image displays of theoptical assembly 180A-B. The first successive displayed image and thesecond successive displayed image partially overlap. The firstsuccessive displayed image has a first successive field of view and thesecond successive displayed image has a second successive field of view.The first successive field of view and the second successive field ofview partially overlap and when stitched together generate thesuccessive field of view 1606B of the successive image 1605B.

FIGS. 17A-D illustrate schematic views 1700A-D of displayed images beinggenerated based on a field of view adjustment. In FIGS. 17A-D, the useris gazing at a three-dimensional interface presented on the imagedisplay of optical assembly 180A-B of the eyewear device 100. As shown,a user is standing, and views three small bitmoji type animatedcharacter figures in front of him, and looks in different directionsbetween the animated character figures to select between the threedifferent bitmoijs, which are then presented in a displayed image.

Any of the user interface field of view adjustment functionalitydescribed herein for the eyewear device 100, mobile device 990, andserver system 998 can be embodied in one more applications as describedpreviously. According to some embodiments, “function,” “functions,”“application,” “applications,” “instruction,” “instructions,” or“programming” are program(s) that execute functions defined in theprograms. Various programming languages can be employed to create one ormore of the applications, structured in a variety of manners, such asobject-oriented programming languages (e.g., Objective-C, Java, or C++)or procedural programming languages (e.g., C or assembly language). In aspecific example, a third party application (e.g., an applicationdeveloped using the ANDROID™ or IOS™ software development kit (SDK) byan entity other than the vendor of the particular platform) may bemobile software running on a mobile operating system such as IOS™,ANDROID™ WINDOWS® Phone, or another mobile operating systems. In thisexample, the third-party application can invoke API calls provided bythe operating system to facilitate functionality described herein.

Hence, a machine-readable medium may take many forms of tangible storagemedium. Non-volatile storage media include, for example, optical ormagnetic disks, such as any of the storage devices in any computer(s) orthe like, such as may be used to implement the client device, mediagateway, transcoder, etc. shown in the drawings. Volatile storage mediainclude dynamic memory, such as main memory of such a computer platform.Tangible transmission media include coaxial cables; copper wire andfiber optics, including the wires that comprise a bus within a computersystem. Carrier-wave transmission media may take the form of electric orelectromagnetic signals, or acoustic or light waves such as thosegenerated during radio frequency (RF) and infrared (IR) datacommunications. Common forms of computer-readable media thereforeinclude for example: a floppy disk, a flexible disk, hard disk, magnetictape, any other magnetic medium, a CD-ROM, DVD or DVD-ROM, any otheroptical medium, punch cards paper tape, any other physical storagemedium with patterns of holes, a RAM, a PROM and EPROM, a FLASH-EPROM,any other memory chip or cartridge, a carrier wave transporting data orinstructions, cables or links transporting such a carrier wave, or anyother medium from which a computer may read programming code and/ordata. Many of these forms of computer readable media may be involved incarrying one or more sequences of one or more instructions to aprocessor for execution.

The scope of protection is limited solely by the claims that now follow.That scope is intended and should be interpreted to be as broad as isconsistent with the ordinary meaning of the language that is used in theclaims when interpreted in light of this specification and theprosecution history that follows and to encompass all structural andfunctional equivalents. Notwithstanding, none of the claims are intendedto embrace subject matter that fails to satisfy the requirement ofSections 101, 102, or 103 of the Patent Act, nor should they beinterpreted in such a way. Any unintended embracement of such subjectmatter is hereby disclaimed.

Except as stated immediately above, nothing that has been stated orillustrated is intended or should be interpreted to cause a dedicationof any component, step, feature, object, benefit, advantage, orequivalent to the public, regardless of whether it is or is not recitedin the claims.

It will be understood that the terms and expressions used herein havethe ordinary meaning as is accorded to such terms and expressions withrespect to their corresponding respective areas of inquiry and studyexcept where specific meanings have otherwise been set forth herein.Relational terms such as first and second and the like may be usedsolely to distinguish one entity or action from another withoutnecessarily requiring or implying any actual such relationship or orderbetween such entities or actions. The terms “comprises,” “comprising,”“includes,” “including,” or any other variation thereof, are intended tocover a non-exclusive inclusion, such that a process, method, article,or apparatus that comprises or includes a list of elements or steps doesnot include only those elements or steps but may include other elementsor steps not expressly listed or inherent to such process, method,article, or apparatus. An element preceded by “a” or “an” does not,without further constraints, preclude the existence of additionalidentical elements in the process, method, article, or apparatus thatcomprises the element.

Unless otherwise stated, any and all measurements, values, ratings,positions, magnitudes, sizes, and other specifications that are setforth in this specification, including in the claims that follow, areapproximate, not exact. Such amounts are intended to have a reasonablerange that is consistent with the functions to which they relate andwith what is customary in the art to which they pertain. For example,unless expressly stated otherwise, a parameter value or the like mayvary by as much as ±10% from the stated amount.

In addition, in the foregoing Detailed Description, it can be seen thatvarious features are grouped together in various examples for thepurpose of streamlining the disclosure. This method of disclosure is notto be interpreted as reflecting an intention that the claimed examplesrequire more features than are expressly recited in each claim. Rather,as the following claims reflect, the subject matter to be protected liesin less than all features of any single disclosed example. Thus, thefollowing claims are hereby incorporated into the Detailed Description,with each claim standing on its own as a separately claimed subjectmatter.

While the foregoing has described what are considered to be the bestmode and other examples, it is understood that various modifications maybe made therein and that the subject matter disclosed herein may beimplemented in various forms and examples, and that they may be appliedin numerous applications, only some of which have been described herein.It is intended by the following claims to claim any and allmodifications and variations that fall within the true scope of thepresent concepts.

What is claimed is:
 1. An eyewear device including: a frame including abridge; a temple connected to a lateral side of the frame; a headmovement tracker or an eye movement tracker; first and second imagedisplays for presenting a sequence of displayed images; first and secondapertures which respectively hold the first and second image displays;an image display driver coupled to the first and second image displaysto control the first and second image displays to present the sequenceof displayed images; a memory; a processor having access to the imagedisplay driver and the memory; and programming in the memory, whereinexecution of the programming by the processor configures the eyeweardevice to perform functions, including functions to: present, via thefirst and second image displays, an initial displayed image of thesequence of displayed images, the initial displayed image having aninitial field of view corresponding to an initial head direction or aninitial eye direction; detect movement of a user of the eyewear deviceby: tracking, via the head movement tracker, a head movement of a headof the user, or tracking, via the eye movement tracker, an eye movementof an eye of the user of the eyewear device; determine, a field of viewadjustment to the initial field of view of the initial displayed imagebased on the detected movement of the user, wherein the field of viewadjustment includes a successive field of view corresponding to asuccessive head direction or a successive eye direction; generate asuccessive displayed image of the sequence of displayed images based onthe field of view adjustment; and present, via the first and secondimage displays, the successive displayed image, the successive displayedimage having the successive field of view representing a combinedthree-dimensional observable area visible through stitching together oftwo displayed images having different fields of view presented on thefirst and second image displays.
 2. The eyewear device of claim 1,wherein: the successive field of view of the successive displayed imageincludes an angle of view between about 15° to 30° measuredhorizontally, vertically, or diagonally.
 3. The eyewear device of claim1, wherein: the initial displayed image is divided into a first initialdisplayed image having a first initial field of view and a secondinitial displayed image having a second initial field of view forpresentation on the respective first and second image displays; and thedetermined field of view adjustment includes a first field of viewadjustment to the first initial field of view of the first initialdisplayed image and a second field of view adjustment to the secondinitial field of view of the second initial displayed image.
 4. Theeyewear device of claim 3, wherein: the successive displayed image isdivided into a first successive displayed image generated based on thefirst field of view adjustment and a second successive displayed imagegenerated based on the second field of view adjustment for presentationon the respective first and second image displays; the first successivedisplayed image and the second successive displayed image partiallyoverlap; the first successive displayed image has a first successivefield of view and the second successive displayed image has a secondsuccessive field of view; and the first successive field of view and thesecond successive field of view partially overlap and when stitchedtogether generate the successive field of view of the successive image.5. The eyewear device of claim 1, wherein: the eyewear device furtherincludes a first visible light camera connected to the first imagedisplay to generate a first background scene of a first successivedisplayed image; the eyewear device further includes a second visiblelight camera connected to the second image display to generate a secondbackground scene of a second successive displayed image; and the firstbackground scene and the second background scene partially overlap topresent a three-dimensional observable area of the successive displayedimage.
 6. The eyewear device of claim 1, wherein: the field of viewadjustment renders visible a first three-dimensional graphical objectwhich was not visible during the initial displayed image; the firstthree-dimensional graphical object is overlaid on a background scene ofthe successive displayed image; the field of view adjustment rendersinvisible a second three-dimensional graphical object which was visibleduring the initial displayed image; and the second three-dimensionalgraphical object is removed from the background scene of the successivedisplayed image.
 7. The eyewear device of claim 6, wherein the firstthree-dimensional graphical object and the second three-dimensionalgraphical object include at least one of an animated character, abitmoji, an application icon, weather information, or a picture.
 8. Theeyewear device of claim 1, wherein: the eyewear device includes the headmovement tracker; the head movement tracker includes an inertialmeasurement unit; and the function of detecting movement of the user ofthe eyewear device includes tracking, via the head movement tracker, thehead movement of the head of the user.
 9. The eyewear device of claim 8,wherein the head movement includes a variation of head direction on ahorizontal axis, a vertical axis, or a combination thereof from theinitial head direction during presentation of the initial displayedimage on the first and second image displays.
 10. The eyewear device ofclaim 9, wherein the function of tracking, via the head movementtracker, the head movement of the head of the user further includes:measuring, via the inertial measurement unit, the initial head directionon the horizontal axis, the vertical axis, or the combination thereof;and measuring, via the inertial measurement unit, the successive headdirection on the horizontal axis, the vertical axis, or the combinationthereof during presentation of the initial displayed image.
 11. Theeyewear device of claim 10, wherein the function of tracking, via thehead movement tracker, the head movement of the head of the user furtherincludes determining the variation of head direction based on both theinitial head direction and the successive head direction.
 12. Theeyewear device of claim 11, wherein the function of detecting movementof the user of the eyewear device further includes: in response totracking, via the head movement tracker, the head movement of the headof the user, determining that the variation of head direction exceeds adeviation angle threshold on the horizontal axis, the vertical axis, orthe combination thereof.
 13. The eyewear device of claim 12, wherein thedeviation angle threshold is between about 3° to 10°.
 14. The eyeweardevice of claim 1, wherein execution of the programming by the processorfurther configures the eyewear device to perform further functions to:after presenting, via the first and second image displays, thesuccessive displayed image, detect fixation of the head of the user ofthe eyewear device by: measuring, via the inertial measurement unit, anupdated head direction on a horizontal axis, a vertical axis, or acombination thereof during presentation of the successive displayedimage corresponding to an updated head direction; and determining theupdated head direction is within a deviation angle threshold of theinitial head direction on the horizontal axis, the vertical axis, or thecombination thereof to indicate negligible head movement of the userthereby indicating fixation.
 15. The eyewear device of claim 14, whereinexecution of the programming by the processor further configures theeyewear device to perform further functions to in response to detectingfixation of the head of the user of the eyewear device, continuing topresent, via the first and second image displays, the successivedisplayed image.
 16. The eyewear device of claim 14, wherein: thefunction of detecting fixation of the head of the user of the eyeweardevice further includes determining a time variation between an initialtime occurring at time of measurement of the initial head direction andan updated time occurring at time of measurement of the updated headdirection; and execution of the programming by the processor furtherconfigures the eyewear device to perform further functions to, inresponse to determining that the time variation exceeds a deviation timethreshold thereby indicating the user of the eyewear device is idle,power down the eyewear device.
 17. The eyewear device of claim 1,wherein: the eyewear device includes the eye movement tracker; the eyemovement tracker includes: an infrared emitter connected to the frame orthe temple to emit a pattern of infrared light on the eye of the user;and an infrared camera connected to the frame or the temple to capturereflection variations in the emitted pattern of infrared light from theeye of the user; and the function of detecting movement of the user ofthe eyewear device includes tracking, via the eye movement tracker, theeye movement of the eye of the user based on the captured reflectionvariations.
 18. The eyewear device of claim 17, wherein the eye movementincludes a variation of eye direction on a horizontal axis, a verticalaxis, or a combination thereof from the initial eye direction duringpresentation of the initial displayed image on the first and secondimage displays.
 19. The eyewear device of claim 18, wherein execution ofthe programming by the processor further configures the eyewear deviceto perform further functions to prior to presenting, via the first andsecond image displays, the initial displayed image, calibrating the eyemovement tracker by: presenting, via the first and second imagedisplays, a series of calibration images for viewing by the eye of theuser, each of the calibration images having a respective point ofinterest at a respective known fixed position on the horizontal axis andthe vertical axis; and in response to the eye of the user viewing therespective point of interest, recording, in an eye direction database,anatomical feature positions of the eye in relation to the respectiveknown fixed position of the respective point of interest.
 20. Theeyewear device of claim 19, wherein the function of tracking, via theeye movement tracker, the eye movement of the eye of the user furtherincludes: initially emitting, via the infrared emitter, the pattern ofinfrared light on the eye of the user of the eyewear device; capturing,via the infrared camera, initial reflection variations in the initiallyemitted pattern of infrared light on the eye of the user; measuring, theinitial eye direction on the horizontal axis, the vertical axis, or thecombination thereof by comparing the initial reflection variations ofthe initially emitted pattern of infrared light on the eye of the useragainst the eye direction database; and successively emitting, via theinfrared emitter, the pattern of infrared light on the eye of the userof the eyewear device; capturing, via the infrared camera, successivereflection variations in the successively emitted pattern of infraredlight on the eye of the user; and measuring, the successive eyedirection on the horizontal axis, the vertical axis, or the combinationthereof by comparing the successive reflection variations of thesuccessively emitted pattern of infrared light on the eye of the useragainst the eye direction database.
 21. The eyewear device of claim 20,wherein the function of tracking, via the eye movement tracker, the eyemovement of the eye of the user further includes: determining thevariation of head direction based on both the initial eye direction andthe successive eye direction.